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• How to set bit values which are not divided on byte boundary

  - by changed

  Hi I have a header field of 2 bytes where first four bits are packet type and other 12 bits are for length. but i don't know how to store this values and retrieve them. I am using ms c++ for client and java for server. It is the client which has to set this values and server has to retrieve it. Thanks

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• how to use JSF 1.2 and JPA in Netbeans ?

  - by user364746

  Hello... I'm trying to use JPA to connect my JSF components to database but the problem is that I can't figure out how to get this all combination works.I have done entity classes from database, also create persistence.xml file and now I don't know where to go!! I don't know how to use entity manager and entity manager factory. Is there any tutorial helps me how to use Java EE 5,JSF 1.2 and JPA in netbeans? any help appreciated Thanks

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• how to chose an open source library ?

  - by radi

  hi guys , when every one of us program in java he would need a library (some jars) to complete his work . so when this programmer find some libraries he need . how he can find the best of these libs ? thanks.

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• Why would an Enum implement an Interface?

  - by kunjaan

  I just found out that Java allows enums to implement an interface. What would be a good use case for that?

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• configuring sms lib for use

  - by jabsy

  i want to write an application that sends bulk sms in java and i have a tutorial but i have to configure sms lib for me to use my modem as the port. can somehelp

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• transpose graph

  - by rana123

  how can i write program in java to find the transpose of the graph G, where the input and the output of the program are represented as adjacency list structure. for example: input: 12341 outout: 1432

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• Is there a possability that method executes only once

  - by Gandalf StormCrow

  I have a for loop and structure like this : for(....) .... .... if(isTrue) ... do something.. .. method to be executed once (doTrick) is declared outside for loop. ....endif endfor public void doTrick() ... ... ..end Is it possible for a method in for loop to be executed only once? I'm using JAVA

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• how to add new elements to a String[] array?

  - by Pentium10

  I have a Java code defined as: String[] where; /**/where.append(ContactsContract.Contacts.HAS_PHONE_NUMBER+"=1"); /**/where.append(ContactsContract.Contacts.IN_VISIBLE_GROUP+"=1"); Those two appends are not working in this form, how would that work correctly?

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• how can i execute other class?

  - by stella

  hi, i have to connect java to mysql db using jdbc. thats not a problem and i can query data from db successfully. the problem is, i have another class that i need to execute which the application is using the data from db. can i execute jdbc and call the application class to executed after the data dragged from db?means, i just execute jdbc class in command prompt and automatically application class also executed

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• Calling outer class function from inner class

  - by santose

  hi, I have implemented a nested class in java. And I need to call the outer class method from inner class. //Code class outter{ void show(){ SOP("outter show"); } class inner{ void show(){ SOP("inner show"); } } } How can I call the outter method "show".

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• Is there anything else other than class, interface or Enum?

  - by GK

  As we know to generate a class file there should be atleast one class or interface or an Enum should be declared in the java file. So i was curious that is there anything else as well other the mentioned which can cause a class file generation. Or did anybody think that as we can declare the above mentioned, we can declare this(Which you think) as well ?

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• ArrayList shallow copy iterate or clone()

  - by user222164

  I need a shallow copy of an java ArrayList, should I use clone() or iterate over original list and copy elements in to new arrayList, which is faster ?

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• Regular Expression

  - by Blanca

  Hi! i would like to avoid texts like this one: height="49" with a regular expresion. I tought in .replaceAll("\s*="*"",""); (replaceAll is used as a method in a java class), but eclipse don't allowed me to do that. Any other suggestion?? tx!

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• malformed url exception

  - by Bunny Rabbit

  https://twitter.com/sessions?authenticity_token=b1b43178e09c1e6ccec1b3183f1f139f39643aaf&session%5Busername_or_email%5D=ddddd&session%5Bpassword%5D=rrrrr&q=&site_action=https%3A%2F%2Ftwitter.com%2Fsessions&serialized_string=Hello why is this url throwing a java.net.MalformedURLException??

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• linked-list interview question

  - by giri

  Hi This was the question asked in interview.Can anybody help me out it in implementing in java Given 2 linked lists(which need not have unique elements) find intersection point in the form of Y.(it can be anywhere--middle or tail)

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• Iterator has .next() - is there a way to get the previous element instead of the next one?

  - by ufk

  I have an Iterator that I use on a HashMap, and I save and load the iterator. is there a way to get the previous key in the HashMap with Iterator? (java.util.Iterator) Update I save it as an attribute in a Red5 connection and then load it back to continue working where i stopped. Another update I'm iterating through the keyset of the HashMap

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• How expensive is synchronization?

  - by someguy

  I am writing a networking application using the java.nio api. My plan is to perform I/O on one thread, and handle events on another. To do this though, I need to synchronize reading/writing so that a race condition is never met. Bearing in mind that I need to handle thousands of connections concurrently, is synchronization worth it, or should I use a single thread for I/O and event handling?

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• Drawing directly on screen

  - by mpetkevicius

  Is it possible in Java to draw shapes and stuff directly on the screen so my desktop remains visible and I can click whatever is underneath my shape? I'm using Windows XP. Thanks.

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• writing 'bits' to c++ file streams

  - by Sorush Rabiee

  How can i write 'one bit' into a file stream or file structure each time? is it possible to write to a queue and then flush it ? is it possible with c# or java? this was needed when i try to implement an instance of Huffman codding. i can't write bits into files. so write them to a bitset and then (when compression was completed) write 8-bit piece of it each time (exclude last one).

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• cast a List to a Collection

  - by Mercer

  Hello, i have some pb. I want to cast a List to Collection in java Collection<T> collection = new Collection<T>(mylList); but i have this error Can not instantiate the type Collection

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• Looking for some kind of code by Contracts that I can use with Eclipse

  - by devoured elysium

  I've tried before some Eclipse plugin (I don't remember its name) but it was lacking a lot of features (generics, for example). Is there anything easy to set up that would run on the last version of Java? Thanks

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• What is the performance cost of calling Thread.isInterupted()?

  - by Michael Barker

  From the java sources, it look like to drops into native code. Is the cost roughly equivalent to a volatile read or does it need to acquire a lock of some type?

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• Singleton Pattern Implementation Issues?

  - by locky28

  Hi I am revising for an exam and need to know some implementation issues with the singleton pattern. they do not need to be too complex just basic things that would affect a developers decision to include them, Thanks P.S. Could any code examples be given in Java thanks.

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• Converting double[][] in to float[][]

  - by cer_albastru

  Hi, I was wondering if there is a way of converting a double [][] in to a float[][] in Java? I currently have a for loop in my code that does this and am looking for a better and cleaner way. Any ideas would be appreciated, Thanks,

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• Retrieving the first digit of a number

  - by Michoel

  Hi, I am just learning Java and am trying to get my program to retrieve the first digit of a number - for example 543 should return 5, etc. I thought to convert to a string, but I am not sure how I can convert it back? Thanks for any help. int number = 534; String numberString = Integer.toString(number); char firstLetterChar = numberString.charAt(0); int firstDigit = ????

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